Compelling Report Card Fails the 9-11 Commission,
In this book, he methodically tears apart each aspect of the 9-11 Commission Report, identifying omissions and distortions covering everything from the alleged hijackers to the actual causes of the collapse of the towers to the role of the Secret Service and the CIA and the FBI to the Saudi and Pakistani engagements with America. In part II, he focuses on the Commission's defense of the U.S. military and its evident failures of either complicity or inaction in relation to each of the flights.
In the end, both books point to the Bush Administration and its neo-conservative ideologues and Wall Street/energy company supporters as being those who gain the most from this crime. In most investigations, that would be a starting point.
See also the various DVDs under 9-11, and see especially Webster Tarpley's book, 9/11 Synthetic Terror: Made in USA, Fourth Edition.